From dbefbb61b785cd77810c032f5cdb499d2a92df07 Mon Sep 17 00:00:00 2001
From: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Date: Thu, 10 Nov 2016 22:21:20 +0100
Subject: [PATCH] sbgdec: prevent NULL pointer access

Reviewed-by: Josh de Kock <josh@itanimul.li>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
---
 libavformat/sbgdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/sbgdec.c b/libavformat/sbgdec.c
index bb020d7f9a..cbedd120fb 100644
--- a/libavformat/sbgdec.c
+++ b/libavformat/sbgdec.c
@@ -927,7 +927,7 @@ static void expand_timestamps(void *log, struct sbg_script *s)
         }
     }
     if (s->start_ts == AV_NOPTS_VALUE)
-        s->start_ts = s->opt_start_at_first ? s->tseq[0].ts.t : now;
+        s->start_ts = (s->opt_start_at_first && s->tseq) ? s->tseq[0].ts.t : now;
     s->end_ts = s->opt_duration ? s->start_ts + s->opt_duration :
                 AV_NOPTS_VALUE; /* may be overridden later by -E option */
     cur_ts = now;